I recently got 2 offers, and the emails appeared in my inbox in real time.
I also sold a card outright, and the email also appeared in my inbox in real time.
Whatever was going wrong before might have been fixed (thanks, COMC!). However, just to be sure, it would probably be best for as many people as possible to send me an offer every hour on the hour for the next week or so. That way, we can see if the bug is affected by time of day, time of the week and so forth.